The protagonist catches his male neighbor either having sex or dry-humping his bed (no woman is shown in the scene). The man is just shirtless, no nudity.
While walking on the street, the male protagonist starts touching his crotch, then puts one hand inside his pants and starts scratching himself. A policeman takes him at station, mistakenly believing the young man was masturbating in public. The suspect then puts down his pants (still has underwear on) to show the policeman that he has a rash on his tights.
A woman acts seductively towards a younger man and doesn't wait for his consent to touch his crotch (over pants). In the next scene it's implied that they had off-screen sex together and that he ejaculated prematurely.
The male protagonist walks casually half-naked (in just boxer shorts and tank top) all over the boarding house he lives in for majority of the movie.
A group of stereotypically gay men (some of them in drag) are seemingly attempting to sexually harrass the protagonist, until the boarding house owner interrupts them.
It's implied that a young man and a young woman have sex. They are covered by a blanket and only their heads and feet are visible, but from the moves and position it's clear.
Several workers at a bulding site are working shirtless.
Several young women are shown wearing see-through nightgowns. They have underwear under.
The protagonist repeateadly catches a neighboring couple having sex (not shown).
It's implied that a group of shady people is secretly filming a porn movie in one of boarding house rooms.
The male protagonist is looking at some pornographic pictures (one showing some female nudity) and says "I might die tonight" as a reference to his masturbatory plans for the evening.
A woman is repeatedly cheating on her boyfriend with a neighbor.
A woman starts act seductively to a younger man and takes off her panties (under her dress) in front of him. Then she starts to kiss him and it's implied that she has off-screen sex with him.
Two men are setting some compromising photographs on fire. The pictures depict some female nudity.